Unbelievable frustraion at "No Auto Parts Available"

I work at oreilly's as a retail service specialist. i try to train my workers on how to find the parts in the catalogs if the computer can't find it. i have had a few people come in and want a part but they don't know what it goes in or the name of the part. like the hanger bearing for the drive shaft. so most of the time i go out and look at their car to find out what they are looking for. over the years i have figured out most of the p0171 & p0174 codes on a ford are caused by a vacuum leak or a loose intake hose after the maf sensor.